1. letsencrypt.sh 证书的生成

1.1 目录的生成

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$ cd ~
$ git clone https://github.com/lukas2511/dehydrated
$ sudo mkdir -p /etc/dehydrated
$ sudo mkdir -p /var/www/dehydrated
$ sudo chown `whoami` -R /var/www/dehydrated
$ sudo chown `whoami` -R /etc/dehydrated
$ cp ~/dehydrated/docs/examples/config /etc/dehydrated/config
$ cp ~/dehydrated/docs/examples/domains.txt /etc/dehydrated/domains.txt

1.2 修改 letsencrypt.sh 配置

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$ vim /etc/dehydrated/config
# 添加如下代码
BASEDIR="/etc/dehydrated/"
WELLKNOWN="/var/www/dehydrated/"

修改域名

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$ vim /etc/dehydrated/domains.txt
# 输入
blog.forecho.com www.forecho.com

1.3 修改nginx的配置

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server {
  listen 80;
  ....
  location /.well-known/acme-challenge {
    allow all;
    alias /var/www/dehydrated/;
  }
  ...
}

重启 nginx

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$ service nginx reload

1.4 执行生成ssl证的脚本

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$ ~/dehydrated/dehydrated --register --accept-terms
$ ~/dehydrated/dehydrated -c

2. 配置ssl证到nginx

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$ sudo openssl dhparam -out /etc/ssl/certs/dhparam.pem 2048

2.1 nginx 的配置

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$ sudo vim /etc/nginx/sites-enabled/blog.forecho.com.conf

添加 ssl 相关信息

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server {
  listen 80;
  listen       443 ssl;
  ## listen 443 ssl http2;
  listen       [::]:443 ssl;
  ## ssl
  ssl on;
  ssl_certificate /etc/dehydrated/certs/blog.forecho.com/fullchain.pem;
  ssl_certificate_key /etc/dehydrated/certs/blog.forecho.com/privkey.pem;
  ## ssl pem
  ssl_dhparam /etc/ssl/certs/dhparam.pem;
  ssl_session_cache shared:SSL:10m;
  ssl_session_timeout 10m;
  ssl_protocols TLSv1 TLSv1.1 TLSv1.2;## omit SSLv3 because of POODLE (CVE-2014-3566)
  ssl_stapling on;
  ssl_ciphers "ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA";
  ssl_prefer_server_ciphers on;
  add_header Strict-Transport-Security "max-age=63072000; includeSubdomains; preload";
}

2.2 测试脚本并重启 nginx

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$ sudo nginx -t
$ sudo service nginx reload

3. 添加自动更新的脚本

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$ mv ~/dehydrated /etc/dehydrated/
$ vim /etc/dehydrated/auto-renew.sh
# 输入
/etc/dehydrated/dehydrated/dehydrated -c
sudo service nginx reload

把脚本改为可执行

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$ chmod 777 /etc/dehydrated/auto-renew.sh

把默认的 nano 改成 vim，如果你喜欢 nano 的话跳过这一步。

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$ vim ~/.selected_editor
# 输入
SELECTED_EDITOR="/usr/bin/vim.tiny"

3.1 添加日志目录

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$ mkdir -p /etc/dehydrated/log

3.2 添加定时任务

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$ crontab -e
# 添加以下代码
1 0 1 * * /etc/dehydrated/auto-renew.sh >> /etc/dehydrated/log/lets-encrypt.log 2>&1

重启 cron 的服务

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$ sudo service cron restart

搞定！

4. 后续添加域名

4.1 修改域名配置

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$ vim /etc/dehydrated/domains.txt

4.2 创建 nginx 域名配置，无 ssl 配置参数，配置信息再加上

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location /.well-known/acme-challenge {
    allow all;
    alias /var/www/dehydrated/;
}

4.3 重启 nginx

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$ sudo service nginx reload

4.4 生成证书

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$ sudo /etc/dehydrated/dehydrated/dehydrated -c

4.5 修改 nginx 配置信息（添加 ssl 配置参数 ，参照上面2.1），然后再重启 nginx

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$ sudo service nginx reload

参考链接： Let’s Encrypt免费的https证书